Quantum imaging holds potential benefits over classical but has faced challenges such as poor signal-to-noise ratios, low resolvable pixel counts, difficulty in biological organisms, and inability to quantify full birefringence properties. Here, we introduce quantum by coincidence from entanglement (ICE), using spatially polarization-entangled photon pairs overcome these challenges. With spatial entanglement, ICE offers higher greater the ability image organisms. polarization provides...

Entangled biphoton sources exhibit nonclassical characteristics and have been applied to imaging techniques such as ghost imaging, quantum holography, optical coherence tomography. The development of wide-field date has hindered by low spatial resolutions, speeds, contrast-to-noise ratios (CNRs). Here, we present microscopy coincidence (QMC) with balanced pathlengths, which enables super-resolution at the Heisenberg limit substantially higher speeds CNRs than existing methods. QMC benefits...

The dissociation energetics in the phenol+⋯Ar2(2π) cluster ion have been investigated using photoionization efficiency and mass analyzed threshold ionization spectroscopy. appearance energies for loss of one two Ar atoms are determined as ∼210 ∼1115 cm−1, respectively. difference between energy first ligand phenol+⋯Ar(π) dimer (535 cm−1) is explained by isomerization π-bound to OH binding site (H-bond) upon ionization. phenol+⋯Ar2(H/π) could also be estimated around 325 which corresponds...

The structures of the van der Waals bonded complexes phenol with one and two argon atoms have been determined using rotationally resolved electronic spectroscopy S1←S0 transition. experimentally structural parameters were compared to results quantum chemical calculations that are capable properly describing dispersive interactions in clusters. It was found both π-bound configurations, phenol-Ar2 complex adopting a symmetric (1∣1) structure. distances aromatic plane ground state n=1 n=2...

The phenol...argon complex was studied by means of various high level ab initio quantum mechanics methods and resolution threshold ionization spectroscopy. structure stabilization energy different conformers were determined. Stabilization van der Waals bonded H-bonded PhOH...Ar determined at CCSD(T) complete basis set (CBS) for CP-RI-MP2/cc-pVTZ/Ar aug-cc-pVTZ geometries amount to 434 285 cm(-1). CCSD(T)/CBS constructed either as a sum MP2/CBS interaction correction term [difference between...

The phenol(+)...Ar(2) complex has been characterized in a supersonic jet by mass analyzed threshold ionization (MATI) spectroscopy via different intermediate intermolecular vibrational states of the first electronically excited state (S(1)). From spectra recorded S(1)0(0) origin and S(1)β(x) state, energy (IE) determined as 68,288 ± 5 cm(-1), displaying red shift 340 cm(-1) from IE phenol(+) monomer. Well-resolved, nearly harmonic progressions with fundamental frequency 10 have observed ion...

Experimental results obtained previously for vdW-bonded and H-bonded phenol...argon (PhOH...Ar) complexes in their S(0) D(0) states are combined with ab initio quantum-chemical theoretical results. Such a combination allows us to present "complete" description of the geometry, relative energies, interaction energies enthalpies PhOH...Ar complexes. Based on minimum-energy-path study, transition structures barrier heights related transitions between stable conformers also presented. For...

The cis- and trans- conformational isomers of formanilide, an aromatic amide which represents a model peptide, have been studied using zero electron kinetic energy (ZEKE) spectroscopy to investigate the properties cationic amides. Accurate ionization energies 67 408 710 ± 5 cm−1 were measured for cis-isomers respectively, allowing trans-conformation be assigned as lower conformation in D0 state. For trans-formanilide, ZEKE spectra are dominated by excitation in-plane side-arm bend (211 cm−1)...

Rotationally resolved zero electron kinetic energy (ZEKE) spectra of n-butylbenzene have been investigated using a spectator orbital model to compare the ionization energetics two molecular conformers. A new ZEKE detection scheme was employed record excitation as function S1←S0 laser photon energy, with fixed laser. These are sensitive probe rotational constants all three states involved, S0 and S1 neutral D0 cation. For gauche-conformer I, cation determined A+=2330.6±2.3 MHz, B+=772.4±1.5...

Two conformational isomers of the aromatic hydrocarbon n-butylbenzene have been studied using two-color MATI (mass analyzed threshold ionization) spectroscopy to explore effect conformation on ionization dynamics. Cationic states g auche-conformer III and anti- conformers IV were selectively produced by excitation via respective S 1 origins. Adiabatic potentials gauche- anti-conformations determined be 70146 69872 +/- 5 cm (-1) respectively. Spectral features vibrational modes are...

Conformational isomers of the aromatic hydrocarbon n-butylbenzene have been studied using two-color REMPI (resonance enhanced multiphoton ionization) and MATI (mass analyzed threshold spectroscopy to explore effect conformation on ionization dynamics. Gauche- anti-cationic conformers were selectively produced by excitation via respective S1 origins. Adiabatic potentials gauche- anti-conformations determined be 70 148 69 955±5 cm−1, respectively. Analysis spectra allowed determination S0 (38...

We investigate a hybrid entanglement distribution protocol based upon nitrogen vacancy centers and microtoroid resonators. The is on the input–output relation nitrogen-vacancy center microresonator coupling, can be distributed between photons solid state qubits with assistance of microcavity resonance. further generalized to quantum repeaters by introducing purification swapping. As systems are promising candidates for long distance communication, proposed enables distant parties achieve...

The gas-phase structures of the two isomers (N–H⋯OH2 bonded and CO⋯HOH bonded) trans-formanilide–water complex have been investigated by two-colour (1 + 1′) resonance enhanced multiphoton ionisation (REMPI) zero electron kinetic energy (ZEKE) spectroscopy. Excitation energies were determined for S1 00 transitions to be 35 787 ± 0.2 cm−1 (NH-bound) 36 118 (CO-bound) which correspond a red shift 218 blue 114 cm−1, respectively. This is in excellent agreement with recent one-colour measurements...

This paper presents an optimal entanglement concentration protocol (ECP) for entangled solid-state systems, using the coherent-state input–output process working in low-Q cavity quantum electrodynamics regime. The system can be described as a three-level atom confined one-side optical microcavity. Using ancillary coherent pulse to perform process, different state-dependent phase shifts of output state discriminated by homodyne detection, and less-entangled atomic pair concentrated maximally...

Two-color REMPI and ZEKE photoelectron spectra are presented for the trans-acetanilide·Ar complex. Methyl rotor features prominent in cluster appear with unperturbed frequencies intensities compared to acetanilide, indicating that argon atom exerts little influence on methyl from its van der Waals binding position above aromatic ring. Analysis of allowed determination S1 D0 barrier heights (50 320 cm−1), S0 0a–1e splitting (3.9 2.0 cm−1).

Quantum correlation is critical in quantum information applications, and numerous inequalities have been established to quantify the non-classical correlations such as Bell nonlocality steering. We introduce an experimental method map full-domain for steering Clauser-Horne-Shimony-Holt scenarios. This approach accounts detection imperfections simplifies interpretations, answering fundamental questions about Additionally, we illustrate its utility calibrating entanglement-based key...

We introduce quantum microscopy by coincidence (QMC) featuring balanced pathlengths, which facilitates super-resolution imaging at the Heisenberg limit, drastically boosting speed and contrast-to-noise ratio (CNR) compared to existing wide-field methods. QMC uses correlated photons traversing symmetric paths, behaving like a photon with half wavelength for twice resolution. It withstands 155 times stronger stray light than classical signals, promising non-destructive bioimaging. Our approach...

Quantum imaging can potentially provide certain advantages over classical imaging. Thus far, however, the signal-to-noise ratios (SNRs) are poor; resolvable pixel counts low; biological organisms have not been imaged; birefringence has quantified. Here, we introduce quantum by coincidence from entanglement (ICE). Utilizing spatially and polarization entangled photon pairs, ICE exhibits higher SNRs, greater counts, of organisms, ghost quantification; it also enables 25 times suppression stray...

Clusters of Ar bound to isomers the aromatic hydrocarbon n-butylbenzene (BB) have been studied using two-color REMPI (resonance enhanced multiphoton ionization) and MATI (mass analyzed threshold spectroscopy explore noncovalent vdW interactions between these two moieties. Blue shifts excitation energy were observed for gauche-BB...Ar clusters, red anti-BB...Ar clusters observed. Adiabatic ionization energies (IEs) conformer BB-I...Ar BB-V...Ar determined as 70052 69845 +/- 5 cm (-1),...

Spektroskopische Charakterisierung kationischer Amide: Durch Untersuchung der kationischen Isomere von Formanilid mit ZEKE-Photoelektronenspektroskopie wurde festgestellt, dass eine deutliche Ladungsdelokalisierung vom aromatischen Ring zur Seitenkette erfolgt. Das Bild zeigt das Spektrum des trans-Isomers sowie schematische Darstellung In-Plane-Biegeschwingung und Streckschwingung Amidgruppe, denen die B′- bzw. Σ′-Bande zugeordnet werden. IE=Ionisierungsenergie.

Quantum correlation between two parties serves as an important resource in the surging applications of quantum information. The Bell nonlocality and steering have been proposed to describe non-classical correlations against local-hidden-variable local-hidden-state theories, respectively. To characterize types correlations, various inequalities established, amount inequality violation indicator for many entanglement-based tasks. state tomography has employed measuring states, while method...